Knowing enough to ask the right question
When the pool goes green on a Saturday and residents are texting the board, you don't need to fix it yourself — but it helps enormously to understand what's actually wrong. Knowing the likely cause lets you ask your vendor a sharp question, judge whether the answer makes sense, and tell whether you're looking at a quick correction or a real repair.
Here are the seven problems community pools run into most, what causes them, and how they're resolved.
1. Cloudy water
What you see: The water loses its clarity and turns hazy or milky, sometimes overnight after heavy use.
Common causes: Poor filtration, unbalanced chemistry (often high pH), insufficient chlorine, or a heavy bather load overwhelming the system. Fine particles stay suspended instead of being filtered out.
The fix: Test and rebalance the water, check that the filter is clean and running enough hours, and sometimes add a clarifier to help the filter catch fine particles. Persistent cloudiness after balancing usually points to a filtration problem — an undersized, dirty, or failing filter.
Water this clear is a clean filter running enough hours against balanced chemistry. Cloudiness that persists after rebalancing is pointing at the filter, not at the water.
2. Algae
What you see: Green (most common), or the more stubborn mustard/yellow and black-spot varieties. The water or surfaces take on a slick, colored film.
Common causes: Low chlorine, poor circulation, low stabilizer letting sun burn off chlorine, or warm water plus heavy use. Algae blooms fast when sanitizer drops even briefly during a heat wave.
The fix: Shock the pool with a heavy chlorine treatment, brush the surfaces (algae clings), run the filter continuously, and correct whatever let chlorine fall in the first place. Black and mustard algae are far harder to kill than green and may take repeated treatments. Prevention — steady chlorine and good circulation — is much cheaper than fighting an established bloom.
3. Chemistry that won't hold
What you see: pH and chlorine bounce around, the water irritates eyes and skin, or the vendor seems to be constantly chasing the numbers.
Common causes: Low total alkalinity is the usual culprit — without that buffer, pH swings wildly. Very high or very low stabilizer, or a malfunctioning chemical feeder, can also make chemistry unstable.
The fix: Get alkalinity into its proper band first; stable pH usually follows. Check the stabilizer level and the chemical feeder's calibration. If chemistry is a constant fight, the underlying issue is often equipment — a drifting sensor or a feeder that's over- or under-dosing.
4. Circulation and pump problems
What you see: Weak flow, a noisy pump, air bubbles at the returns, or the pump losing prime and shutting down.
Common causes: A clogged pump or skimmer basket, a dirty filter, a leak on the suction side letting air in, or an aging pump motor near the end of its life.
The fix: Clear the baskets and clean or backwash the filter first — many "pump problems" are just a clog. Air bubbles usually mean a suction-side leak to find and seal. A pump that's loud, running hot, or repeatedly failing is likely worn out and headed for replacement, which is a planned expense worth anticipating.
5. Staining and scaling
What you see: Discoloration on the plaster (brown, green, or gray stains) or a rough, crusty white buildup at the waterline.
Common causes: Stains often come from metals in the water (from fill water or corroding equipment) or organic debris left too long. Scaling is calcium deposit, driven by high calcium hardness and high pH.
The fix: Metal stains may need a stain treatment and a sequestering agent to keep metals in solution. Scaling calls for correcting calcium and pH, and sometimes mechanically cleaning the deposits. Chronic staining or scaling points back to water balance — fixing the chemistry prevents the recurrence.
6. Leaks
What you see: The water level drops faster than evaporation explains, the auto-fill runs constantly, or there's persistent wet ground near the equipment pad.
Common causes: Cracked plumbing, a failing pump seal, deteriorated fittings, or a crack in the pool shell itself. Some evaporation is normal in hot weather, so the trick is distinguishing normal loss from a true leak.
The fix: A simple bucket test can confirm whether loss exceeds evaporation. Real leaks need detection to locate — equipment-pad leaks are often visible and fixable; underground plumbing or shell leaks require specialized detection and can be significant repairs. Ignoring a leak wastes water, chemicals, and heat, and can undermine the deck or structure over time.
7. Deck, fence, and safety-equipment wear
What you see: Cracked or heaving decking, a gate that no longer self-latches, faded signage, or missing rescue equipment.
Common causes: Ordinary weathering and heavy use over seasons. These degrade quietly and get overlooked because they're not "the water."
The fix: These are the items an inspector — and a plaintiff's attorney — look at hardest. A self-closing, self-latching gate is your primary drowning-prevention feature and must work every single time. Keep signage legible and rescue equipment present and unobstructed. Deck repairs range from minor patching to reserve-level replacement, so catch them early and plan the big ones.
The pattern behind most problems
Look across this list and a theme emerges: most recurring pool problems trace back to either chemistry that wasn't held steady or equipment that wasn't maintained or replaced on time. Both are prevented by consistent, competent service and honest end-of-season assessments — not by heroics after something goes wrong. A pool that gets steady attention rarely surprises you; a neglected one lurches from crisis to crisis.
Getting ahead of it
The board's real job here is making sure a capable pool company is on the water consistently and flagging wear before it fails. Chemistry read and logged on every visit, a filter cleaned on a schedule, a pump replaced the winter before it dies — that is what keeps the seven problems above off your agenda.
HOAcrew is where a board runs this. Vetted independent local pool companies submit proposals against the scope you publish; your board compares them side by side, selects one, and the contract is between your community and the company it chose. HOAcrew verifies the three documents that decide a bid — general liability, workers' compensation and the credential that company's trade requires, and an admin reads each certificate of insurance and files what the document says, with every expiry date held against the limits your community sets, on a 30-day renewal window for the insurance lines. Every company's own invoice arrives in one view, with the visit records beside it, so a season of readings and equipment notes reads as one history instead of a folder of forwarded emails.